480  
FNUS74 KHUN 311255  
FWSHUN  
 
SPOT FORECAST FOR RIDDLE...USFS  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
655 AM CST WED JAN 31 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CST ON JANUARY 31.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
DRY AND MOSTLY SUNNY CONDITIONS ARE EXPECTED NEAR THE BURN SITE  
TODAY WITH SOUTHERLY TRANSPORT WINDS OF BETWEEN 13 TO 21 MPH AT  
THE IGNITION TIME. WIND GUSTS ARE NOT EXPECTED AT THE SURFACE.  
MEANWHILE, MINIMUM RELATIVE HUMIDITY VALUES MAY DROP BELOW 30%  
AROUND 1 TO 4 PM NEAR THE BURN SITE TODAY AS THE TEMPERATURE RISES  
TO BETWEEN 56 TO 58. MIXING HEIGHTS SHOULD GRADUALLY RISE TO  
AROUND 2000 FEET BY 11 AM AND 2400 FEET BY 2 PM.  
 
THEN, TONIGHT, NOT EXPECTING ANY FOG FORMATION WITH SOUTHEAST  
WINDS VEERING TO THE SOUTHWEST AFTER 1 AM.  
 
THURSDAY'S FORECAST WILL BE DIFFERENT WITH INCREASING RAIN  
SHOWERS EXPECTED AHEAD OF A COLD FRONT. MINIMUM RELATIVE HUMIDITY  
VALUES WILL BE AROUND 75% AS DEWPOINTS RISE INTO THE 40S AND AIR  
TEMPERATURES RISE INTO THE MID 50S.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (10-20 PERCENT).  
MAX TEMPERATURE.....56 TO 58.  
MIN HUMIDITY........29 PERCENT.  
WIND (20 FT)........SOUTH WINDS 7 TO 8 MPH.  
CHANCE OF PCPN......0 PERCENT.  
MIXING HEIGHT.......1200-2400 FT AGL.  
TRANSPORT WINDS.....SOUTH 13 TO 21 MPH.  
LVORI...............2.  
 
TIME (CST) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........MCR MCR MCR MCR MCR MCR MCR MCR  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............43 47 51 55 57 57 55 52  
RH..............45 40 34 30 29 29 32 38  
20 FT WIND DIR..180 190 190 190 190 190 180 180  
20 FT WIND SPD..7 8 8 8 8 8 7 7  
20 FT WIND GUST.8 10 10 10 10 10 10 8  
MIX HGT (KFT)...1.3 1.8 2.1 2.3 2.4 2.2 1.8 1.2  
TRANSP WIND DIR.180 190 200 190 190 190 190 180  
TRANSP WIND SPD.13 16 18 20 21 21 20 17  
DISPERSION IDX..8 36 48 54 58 55 45 28  
LVORI...........2 2 1 1 1 1 1 1  
CHC OF PCPN (%).0 0 0 0 0 0 0 0  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT), THEN BECOMING  
MOSTLY CLOUDY (55-65 PERCENT).  
MIN TEMPERATURE.....AROUND 44.  
MAX HUMIDITY........93 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 6 MPH.  
CHANCE OF PCPN......10 PERCENT.  
MIXING HEIGHT.......500-1100 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 13 TO 17 MPH.  
LVORI...............4.  
 
TIME (CST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........MCR MCR MCR MCR MCR MCR PC PC MC MC MC MC  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............49 47 46 45 45 44 44 44 44 44 44 45  
RH..............44 49 51 55 58 62 68 73 79 86 89 89  
20 FT WIND DIR..170 170 180 180 180 190 190 190 200 200 200 200  
20 FT WIND SPD..6 6 6 6 6 6 6 6 6 6 6 5  
20 FT WIND GUST.7 7 7 7 7 7 7 7 7 7 6  
MIX HGT (KFT)...0.8 0.6 0.5 0.5 0.6 0.7 0.8 1.0 1.0 1.1 0.9 0.8  
TRANSP WIND DIR.180 180 180 180 180 190 190 200 200 200 200 210  
TRANSP WIND SPD.16 16 16 16 16 17 17 17 17 17 15 13  
DISPERSION IDX..16 12 11 11 13 16 8 12 12 12 10 8  
LVORI...........2 2 2 2 2 2 3 3 3 5 5 5  
CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10  
   
THURSDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). A CHANCE OF  
SHOWERS IN THE MORNING, THEN A CHANCE OF RAIN  
IN THE AFTERNOON.  
MAX TEMPERATURE.....AROUND 57.  
MIN HUMIDITY........72 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS 5 TO 6 MPH UNTIL LATE  
AFTERNOON, BECOMING LIGHT.  
CHANCE OF PCPN......50 PERCENT.  
MIXING HEIGHT.......900-2400 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 12 TO 21 MPH, DECREASING TO 8 TO 10  
MPH LATE.  
LVORI...............5.  
 
TIME (CST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........MC MC MC MC MC CDY CDY CDY CDY CDY CDY CDY  
WEATHER COV.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC  
WEATHER TYPE....RW RW RW RW RW RW RN RN RN RN RN RN  
TEMP............45 46 48 50 52 54 56 57 57 57 56 55  
RH..............93 93 89 86 83 80 74 72 72 72 74 77  
20 FT WIND DIR..200 200 210 210 210 220 220 220 230 240 250 280  
20 FT WIND SPD..5 5 5 5 5 6 6 6 5 5 3 3  
20 FT WIND GUST.6 6 6 6 6 7 7 7 6 6 6 5  
MIX HGT (KFT)...0.9 1.3 1.9 2.3 2.4 2.4 2.2 2.0 1.8 1.6 1.3 1.0  
TRANSP WIND DIR.210 220 230 230 230 230 240 240 230 230 240 250  
TRANSP WIND SPD.12 14 17 21 21 20 18 17 16 14 10 8  
DISPERSION IDX..8 9 12 14 14 41 37 34 29 23 15 11  
LVORI...........6 6 6 4 4 4 3 3 3 3 3 3  
CHC OF PCPN (%).40 40 40 40 40 40 50 50 50 50 50 50  
 

 
FORECASTER...LATIMER  
REQUESTED BY...KERRY  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1801269.0/HUN  
.EMAIL KERRYCLARK@FS.FED.US  
 
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